Method of making key bolts



Feb. 20, 1923. I

' .1. ZILLIOX METHOD OF MAKING KEY BOLTS Filed Mar. 24, 1922 l3zvrz Z07I Jfiorrigya.

4 7 a a! V Patented Feb. 20, 1923. i

JOHN zrnnrorr, or oncnann geanir, NEW YORK;

METHOD on Maxine KEY :Bon'rs.

Application filed March 24-, Serial K0,. 546,340.

producing that type ofbolts which are held in place by a key driventhrough a slot in the same and which are commonly known'as key bolts. orI I One of the objects of this invention is to )rovide a methodfor'producing a bolt of" this character in which the metal is sodistributed that the strength of the same is increased and the strainupon the same when tightening the key is caused to bear uponthe body ofthe bolt in such manner that there is no tendency to tilt or defiectthebody but instead exert a straight pull on the central part thereof andthus ensure the maximumv service for the amount of metal employed in thebolt.

Another object is to provide an improved method of manufacturing suchbolts whereby the same may be produced from a solidpiece of metal moreeconomically and expeditiously and'by the use of fewer operations andtools than have been required heretofore.

In the accompanying drawings:

Figure 1 is a side elevation ofakey made in accordance with my' methodand showing the same connecting two plates, the latter being shown insection. Figure 2 is a sectional elevation of the bolt in connectionwith a key which is shown in elevation. Figure 3 is a cross section ofthe bolt taken on line 3-3, Fig. 2. Figure 4: is aside view of the boltand key taken at right an les to Figs. 1 and 2.

imilar characters of reference indicate corresponding parts in theseveral views.

In its general structure, the bolt constructed in accordance with mymethod comprises a body or shank 10 which preferably has a cylindricalexterior and provided with a longitudinal slot 11 adapted to receive akey 12 for engaging one side of the part to which the bolt is applied,and an integral one piece head 13 arranged at the rear end of the bodyand adapted to engage with the opposite side of the part to which theboltis applied, A s shown in the drawings the bolt bolt is representedas coupling two metal plates 15, 16, the overlapping parts Of which areprovided with registering openings 1 17,

18 which receive the body or shank'ofv'thebolt and one of said platesbeing engaged by the head of the bolt and the other by said key. jhefrontend'l9 of the body is preferably tapered, so as to form a drift orcentering end which permits of more readily inserting; the same into theopenings of the plates and aligning the latter.

front and 'rear transverse end walls. *Thefront end wall tapersrearwardly and has The slot in the body is provided at its op- I positesides "with two. parallel longitudinal p walls 20. 20, and at itsopposite end with two concave" curved faces, 21.21, "which con- I vergefrom the opposite sides of the body inwardly toward the center of thesame and terminate atthe apex" between the same in a blunt face 22forming a seat for thead;

toward the center of the same and terminate at the apex thereof in a.sharp edge '24 which angles to the directionfofjacent longitudinal edgeof'the key 12. The

rear end wall tapersrforwardly andhas two concave curved faces 23, 2 3which'converge from the oppositesides of the body inwardly 5 wall of theslot inthe "bolt, the'blunt seat 22 forms a-bearing for thekey which isar ranged in the center of the boltso that the strain exertedupon thelatte'rwhen tightening the key produces a pull (in thebolt whichisdistributed-over the entire metal of the axis, thereby preventing thebolt from being shape which not only reduces its holding same and in adirection parallel with its eiiiciency but also renders the boltunfitffor most effective use until the straightened. v g

Bymaking the rear end wall of the slot in the bolt of forwardly-taperingform, the strength of the bolt next to its head is masame is againterially increased, owing to the increased 1 amount of metal at thisplace 'which'serve's to prevent the hea h-from being pulled off underexcessive strains.

Moreover, this construction of bolt is much stronger and is not liableto stretch outof I shape when in use, and owing to the head being in onepiece and formed integrally with the body, leakage pastthe sam'e cannotoccur when the same is used for connecting the plates of a tank or Wallintended to oonfine a liquid.

This bolt is made by first producing a circular cut lengthwise in thebody from one side thereof by means of a rotary milling cutter of anysuitable construction, which "taco 21 ill and Q3, 23 of the front andrear end Walls of the key slot. After the slot has been thus termed, theapex of the front taperin end Wall is removed to form the blunt seat 22by means oi a punch or breaching tool or a .y other approved manner.

This method of making the bolt is very simple and permits of producingthe same rapidly and economically without the use of expensiveequipment.

A key bolt thus constructedutilizes the amount or" metal therein tobetter advantage, inasmuch as the same is disposed Where most needed andthus secures the maximum i ieeneo strength. Bolts of this character areparticularly desirable for temporarily fitting together Work which issubsequently permanently connected by ordinary bolts or rivets, such asiron for buildings, plates for tanks and ships, and the like, in whichcase the key bolts can be quickly applied to and removed from the Work.Obviously, however, these bolts may be used for permanent connectingmeans, if desired.

I claim as my invention:

The hereindescribed method of making key bolts Which consists in firstproducing a circular cut lengthwise in the body of the bolt from oneside of the same and then producing a similar cut therein from theopposite side thereof, so as to intersect the. first mentioned cut andthereby forming a longitudinal slot in the body which is adapted toreceive a key, which cuts produce front and rear end walls for said slotwhich taper toward each other from opposite sides of said body, and thenremoving the apex of the front end Wall to form a blunt seat thereon forsaid key.

JOHN ZILLIOX.

